Nearly a quarter century after its debut, Nissan wants to remake one of the luxury vehicle market's perpetual underdogs into a global contender on par with the German powerhouses. It is a challenging task. Infiniti has struggled to get equal footing with rival Toyota Motor Corp.'s Lexus brand in the U.S. market. Infiniti hasn't fully capitalized on the engineering resources of its parent like Volkswagen AG's Audi, or crafted a premium image as alluring...